Compound locomotive engine



June 5, 1928.

C. K. GETCHELL COMPOUND LOCOMOTIVE ENGINE Filed April 1926 3 Sheets-Sheet 1 June 5, 1928.

c. K. GETCHELL COMPOUND LOCOMOTIVE ENGINE Filed April '1926 3 Sheets-Sheet 2 -FIG. 5:

INVENTOR 65ml: 1M

I ATTO EY June 5, 1928.

C. K. GETCHELL COMPOUN]? LOCOMOTIVE ENGINE Filed April 1926 3 Sheets- Sheet 3 FIG- 3:-

INVENTOR CLMQLM W,

ATTO NEY Patented June 5,1928.

v UNITED STATES PATENT OFFICE. I

CHARLES K, GETCHELL, .orj'soH nEcrAnY, NEW YORK.

' f GQMPOUND tooomorrvn E GINE.

' Application filed April 9, 192s, Serial uo.,1oo,s34.

My invention relates to variable operating mechanism for cylinders for compoundf articulated engines, and particularly to the use of relatively'longen cutoffs for the low pressure cylinders than are. at present in use. I One of the objectsfof'my invention is to provide means for obtaining predetermined variable relations between high and low pressure cutoiis, preferably 'with a single cutofi lever. Myinventionalso 'com prises various features which If'shall here inafterdescribe and claim, I s In the accompany ng draw ngs Figure '1 is a side view, in elevation, ofan articulated compound locomotive, embodying my in-' vention, certain of the partsb'eing dia' ram matically indicated; Figs.v 2 and 3, si front elevations, respectively, "on an enenlarged scale, of :the reverse lever, and quadrant, diagrammatically indicated in Fig;1; F ig.' 4, a diagram indicating the rela;

connection with the modification shown in Fig. 6. o

The improvement claimed is hereinafter fully set forth: In the practice. of my inven tion, referring descriptively to the specific embodiment thereof which is herein exemplified in; Figs, 1,2, 3 and 4,; the locomotive comprises a boiler 2, high pressure cylinders 3, low pressure cylinders 4, and. reverse cylinders 5' and 6 for operating,

' respectively, the high and the low'pressure valve gears. The cylinders 5 'and 6 of the power reversing gear are separately con trolled by the reverselever 7 from the cab 8, The operating valveof the cylinderb is controlled by the valve operating rod 9,

whiizh is connected to the boss 10 on the 1ever7, and by thev movement of said lever through the reach rod' 11 and connections 11 adjusts the positions of the high pressure valve. gear. The operating valve of the cylinder 6 is controlled by thevalve operating rod 13, which. is connected to the boss 14 on the auxiliary lever. 15 and by the movement of the lever through the reach.

e and tion-of the low pressure valve gear.

lever" 17, link 18 and pawl 19,1andis fulcrumed on the pin 20 0f the quadrant bracket 21 which-supports the quadrant 22.

The levers 7 and 15 are pivotally supported- 'onthe fulcrun'ipin 20. The link 23pivot;

ally Connects the auxiliary lever 15, to a crank arm 24' of the bell" crank lever, fulcrumed at 25 "to the lever 7. The other arm 26' ofthebellcrank lever carries a pin 27 which operates'in a' cam slot 28' in the bracket 21. The bosses 10 and 14- are pre- As the lever-*7 ismov'ed from the central position, shown in Figs. 2 andj8, into forward position, the pin 27-0n the arm 26 follows the slot 28 in'the bracket 21. Asthe pin 27'moves along the slot 2 8 'its center changes the distance from the pin20, while the pin 25 as it is mounted on the lever 7- is maintained a constant distance from the pin 20. As the pin 27 moves nearer the pin 20 it necessarily moves the lever arm 26, which in turn throughthe pin 25 moves the arm 24 with relation to the lever 7. Thearm 24 in turn through the link 23' moves the lever 15 so-tha'tits center line is advanced to a eater degree than the center of the lever. As thevalve operating rod 13 connects thebo'ss 1d of the lever 15 with the valve gear for the low pressure cylinders 4,

while the rod 9 connects the boss 10 of the lever 7 with the highpressure cylinders 3, this greater'movem'ent of'the lever 15 results in a longer cutoff in the low pressure cylinders than in the high pressure cylinders for all points of the stroke in forward gear at which the center line of the slot-28 is at a shorter distance from the pin 20 than an arc struck from that point through the original position of the pin27.

The various positions of the levers are inrod'16 and connections 16 adjust the posi- The'reverse lever 7 has" the usual latch fera'bly as shown below and above thepin dicated diagrammatically in Fig. 4. Thus theanunibers 7 25-20 10 representsthe, center line of the lever 7 in central position;

numbers 20'14.30 the central line of the lever 15 in central" position, WVhen the lever '7 has been moved over to the A- position, the boss 14 will accordingly be moved over to, the 14a position through the action of'the pin27 acting through the bell crank 24 -26; an'd the link 23. When the lever is moved to the endof the stroke to the pocentral position than the lever 7 It will sition, the pin 27 reaches the 27 position in the end of the slot 28, the boss 14 the 14 position, and the lever 15 is returnedto its original relation to the lever 7, with the center line of its lower portion inline with the B position of the lever 7 As the arc of the slot 28 is struck from the pin 20 as a center, it is obvious, as is shown in Fig 4, that when the lever 7 1s moved into reverse no alteration will take place in the relative positions of the levers 7 and 15.

In Fig. 5 I have indicated diagrammatically a modified vform of my improved cutoff mechanism, in which the contour of the left-hand side of the slot 28 has been changed so that in reverse the pin. 27 in travelling from central position to extreme reverse position indicated at 27 traverses a path whichduring most of the move-; ment is out of an are passing through" the points 27*; and 27 and having its center atpin 20 When the pin 27 is moved; further away from the pinQO than when in its central position it operates through the crank 2426- and the link 23 to move the lever 15 to a point further from the be seen that center lines of levers 7 a and 1 5? coincide between the points 20 and 14 in central position, are separated when moved into the A or O position, and are together again in the B or D extreme position.

In the embodiment of .my invention shown in'Figs. 6, 7 and 8 I have illustrated an articulated compound locomotive having tliensual high and low pressure cylinders 33, 34 with the ordinary type of reverse lever 37 and quadrant 52in the cab 38.- The operative order of the reversecylinder is controlled by the valve operating rod 39, which connects with the boss-40 on the lever 37 and operates through the reach rod 46 and pin connection 47 to move the lever 48 of the variable cutoff mechanism particu.-'

larly shown in Figs. 7 and 8. The intermediate lever 48 is fulcrumed on the shaft 49,

which is supported in thebearings 50 and 51, and has rigidly mounted thereon the auxiliary lever 52. 'Thefupper end of the lever 52 is connected by a link'53 to the arm' 54 of the bell crank lever, the pivot 55 of which is mounted on the lever 48.. .The'

arm 56 of the bell crank carries a pin 57 which operates in a cam slot 58 in the sup- It will thus be seen that the embodiment of my invention shown in Figs. 6, '7 and 8 "perates on the same pri ciple as that shown in preferred form.

I claim as my invention and desire to secure by Letters Patent:

1. In a compound locomotive, the combination of a. reverse gear comprising a high pressure cutoil adjustment lever alow pressure. cutoff adj ustment lever; ,a bell crank lever fulcrumed on one of said levers, and.

guiding means for onev arm of said bell v, crank lever, the other arm being attached to the otherof said reverse levers. 2L In'aTcompound locomotive, the 'combi nation ofhigh and low pressure cylinders;

adistribution valveior each Ofsaidcy1inders; a lever operableto adjust the point 01fcutoff ofthe valve of the high 'pressureicyh i inder; a second lever associated therewith;

atively. to the first to vary the length" of the cutoff. of thevalve of the .low pressure cylinder with reference to that ot the high,

pressure cylinder. I i

3. The combination, in alo'comotive, of a high pressure cylinder; a low pressure cylinder; a distribution valve for each cylin der; and mechanism for automatically varying the degree of cut-01f of the valve'of one of the cylinders relatively to that of the other, comprising a reverse lever, an a'uxiliary lever, a bell-crank lever plvotally connectedto thereverse lever, a link. connecting an arm of the. bell crank lever, With the.

auxiliary lever, a cam guide, and means connected, to the other arm of'the bell crank lever, disposed for traverse along said guide,

whereby a differential between the rate of traverse, of the reverse lever and the auxiliary lever will be efie'cted.

4. The combinatlon, in a hi' h pressure cylinder' a low pressure cylin er; a distribution va for each cylinder;

and valvecontrolling mechanism, comprising afpower cylinder piston for adjusting the high pressure valve, a power cylinderpiston for adjusting the low pressure valve, a manually movable reverse lever for controlling the operation of one of-the' powerfcyliin locomotive, of 'a and means for moving'the second lever rel- IOU der pistons, an auxiliary] lever associated with the reverse lever, for controlling the operation of the, other power cylinder pis ton, a bell crank lever, pivotedto the reverse lever, a link connecting one'arm of the bell crank lever to the auxiliary lever, a;ca'm guide, and means associated Withjthe other arm of the bell crank lever, .disposedfor traverse along said guide, whereby a differential between the rate of traverse "of.

the reverse lever and the. auxiliarylever, will be effected. v v f 5. The combination, in a locomotive, of a high pressure cylinder; a low pressure cylinder; a distribution valve for each cylinder; and valve controlling mechanism comone arm of the bell crank lever to the auxprising a power cylinder piston, an interiliary lever, a cam guide, and means, asso- 10 mediate lever, actuated by the piston for ciated with the other arm of the bell crank adjusting both of the valves, a manually lever, and disposed for traverse along said movable reverse lever for controlling the guide whereby differential between the rate operation of the power cylinder piston, a of traverse of the intermediate lever and bell-crank lever pivoted to the intermediate the auxiliary lever, will be effected.

lever, an auxiliary lever, a link connecting CHARLES K. GETCHELL. 

